Closed-loop control method of subway energy feedback device

Abstract

The invention relates to a closed-loop control method of a subway energy feedback device. The method comprises the following steps that 1) a target voltage value Udc-ref of a DC contact net is arranged manually, the voltage Udc of the DC contact net is detected in real time, and a voltage controller of the DC contact net compares the Udc-ref with the Udc to obtain deltaU; 2) three phases of voltage transformers PT1, PT2 and PT3 detect sampling electrical-network voltages Usa, Usb and Usc of three phase lines at the step-up side respectively, and the sampling electrical-network voltages Usa, Usb and Usc are calculated by a phase-locked loop PLL to obtain an electrical-network synchronization signal omegat needed by dq reverse transformation; 3) an axis-q reactive current instruction lq-ref is set according to a reactive scheduling requirement issued by a peripheral superior control system; and 4) three phases of control output Uia-ref, Uib-ref and Uic-ref are input to a three-phase scheduling module for single-pole frequency multiplication modulation to obtain three phases of pulse signals, and each phase includes 4 paths. Thus, the frequency is multiplied at the low-voltage ends of the voltage transformers, correct three-phase AC is fed to the middle-voltage AC electrical network, and the voltage of the DC contact net is stabilized.

Description

technical field [0001] The invention relates to a closed-loop control method of a subway energy feedback device. Background technique [0002] With the rapid expansion of city scale, the existing ground transportation system can no longer meet the transportation needs of urban life. To achieve efficient, orderly and time-saving transportation effects, the construction of underground transportation has become more and more important in recent years. Importantly, in any large city, the coverage of its subway system accounts for more than one-third of the city's area. [0003] During the operation, due to the fast running speed of the subway and the large number of stations, the transit time between two adjacent stations is generally controlled between two and three minutes, which leads to frequent starting and braking of the subway. , During the braking process, a huge amount of braking energy will be generated. If it is wasted and not used, it has to be said to be very luxur...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing inverter feedback control method cannot be applied to the subway energy feedback device based on the 3-phase H-bridge inverter and the LCL filter, and cannot achieve the purpose of stabilizing the DC catenary voltage

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